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Gramener Interview Questions and Answers

Updated 10 Sep 2024
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Q1. What lubricant oil is used in hydraulic system and what grade oil is suitable for in hydraulic?

Ans.

The lubricant oil used in hydraulic systems is hydraulic oil, and the suitable grade depends on the specific requirements of the system.

  • Hydraulic oil is specifically designed for use in hydraulic systems to provide lubrication, cooling, and sealing.

  • The grade of hydraulic oil depends on factors such as operating temperature, pressure, and system design.

  • Common grades of hydraulic oil include ISO VG 32, ISO VG 46, and ISO VG 68.

  • It is important to consult the manufacturer's recom...read more

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Q2. Difference between pressure regulating valve and pressure reducing valve?

Ans.

Pressure regulating valve maintains a constant pressure downstream, while pressure reducing valve reduces the pressure from a higher level to a lower level.

  • Pressure regulating valve maintains a constant pressure downstream by adjusting the flow rate through the valve.

  • Pressure reducing valve reduces the pressure from a higher level to a lower level, ensuring it stays within a specific range.

  • Pressure regulating valves are commonly used in industrial processes to maintain consis...read more

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Q3. What is DC valve and how it's working?

Ans.

A DC valve is a type of valve that controls the flow of direct current (DC) electricity in a circuit.

  • DC valves are used to regulate the flow of DC current in various applications.

  • They can be either normally open or normally closed, allowing or blocking the flow of current respectively.

  • DC valves are commonly used in hydraulic systems, automotive applications, and industrial machinery.

  • Examples of DC valves include solenoid valves, check valves, and proportional valves.

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Q4. What is pressure point of a gear?

Ans.

Pressure point of a gear is the point where the maximum force is applied to transmit power.

  • Pressure point is where the teeth of two gears come into contact.

  • It is the point where the force is exerted to transmit power from one gear to another.

  • Proper lubrication and maintenance of pressure points are essential for smooth gear operation.

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Q5. How does centrifugal pump work?

Ans.

Centrifugal pump works by converting mechanical energy from a motor into kinetic energy in the fluid being pumped.

  • Centrifugal force is created by the rotation of the pump impeller, which pushes the fluid towards the outer edges of the pump casing.

  • The kinetic energy of the fluid increases as it moves through the pump, creating pressure that forces the fluid out of the pump discharge.

  • Common applications of centrifugal pumps include water circulation in HVAC systems, wastewater ...read more

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Q6. What is the meaning of pump?

Ans.

A pump is a mechanical device used to move fluids from one place to another.

  • Pumps are commonly used in various industries such as water treatment, oil and gas, and manufacturing.

  • There are different types of pumps including centrifugal pumps, diaphragm pumps, and gear pumps.

  • Pumps can be powered by electricity, engines, or manual operation.

  • Examples of pumps include water pumps used in households, fuel pumps at gas stations, and sewage pumps in wastewater treatment plants.

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Q7. What is module of a gear?

Ans.

Module of a gear refers to the ratio of the pitch diameter to the number of teeth on the gear.

  • Module is a key parameter in gear design and is used to determine the size of the gear teeth.

  • It is calculated as the ratio of the pitch diameter to the number of teeth on the gear.

  • Common modules include 1, 1.5, 2, 2.5, etc.

  • Higher module values indicate larger gear teeth and vice versa.

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Q8. What is Pascale law?

Ans.

Pascal's law states that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container.

  • Pressure applied to a confined fluid is transmitted equally in all directions.

  • The principle is used in hydraulic systems to generate mechanical force.

  • Example: Hydraulic car brakes work based on Pascal's law.

  • Example: Hydraulic lifts use Pascal's law to lift heavy objects.

  • The law is named after Blaise Pascal, a Fre...read more

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